The best way to tame birds is to not force yourself on them.  Let them come to you.  Offer treats freely to them every day, just tossing them on the ground.  Talk to them in a soft, pleasant voice.  Move slowly around them and don't try to grab them.  Let them watch you and learn that you aren't a threat or aggressive towards them.
Don't do a hard stare at them, as that's what predators do.  Turn your head away if they're watching you in a nervous way, so you don't look threatening.  Watch them in a more casual manner, only glancing at them.  Do slow blinks, that helps, too.
If you don't push them, they'll decide you aren't a threat sooner.  They'll stop wasting a lot of time worrying about what you're going to do and relax.  Once that happens, they'll be underfoot, crowding around for the treats.
Hulled sunflower seeds are like chicken crack, if you need something a little more special.  Mealworms are also great, once they get used to eating wriggly things.